<van-nav-bar :title="title" left-arrow>
    <van-icon name="search" slot="right" />
  </van-nav-bar>

<div>

    <van-button>按钮 {{title}}</van-button>
    <!-- 开启 safe-area-inset-bottom 属性 -->
    <van-number-keyboard safe-area-inset-bottom />

</div>